JPH0247611Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parabolic antenna for receiving satellite broadcasting, and more particularly to improvements in the support arm and stay for supporting the radiator and converter.

When receiving satellite broadcasting, the radio waves are weak at 12GHz, so a high-performance receiving antenna is required. As such an antenna,
A parabolic antenna as shown in FIG. 1 has been proposed. In the figure, reference numeral 11 denotes a reflecting mirror, and a reinforcing rib 12 is provided on the back surface of this reflecting mirror 11. A mounting bracket 13 is attached to this reinforcing rib 12, and the mounting bracket 13 fixes the reflector 11 to the column 14, and also allows rough and fine adjustment of its elevation angle and azimuth angle. There is. A converter 15 and a radiator 16 are arranged at the focal point of the reflecting mirror 11. The converter 15 and the radiator 16 are fixedly supported at one end of a support arm 17 whose other end is fixed to the lower part of the reflecting mirror 11. This support arm 1
7 is supported at its other end by one stay 18. This stay 18 has a fixed saddle (not shown) in its center as shown in FIG.
It is tightened and fixed to the support arm 17 with screws, with the support arm 17 interposed therebetween. The stay 18 is bent into a substantially V shape from its center, and the reflector 1 is attached to both ends of the stay 18.
It is fixed to the rib on the back side of 1 with a nut.

Incidentally, in the parabolic antenna described above, the support arm 17 and the stay 18 usually have a round pipe-like appearance due to the ease of obtaining materials and processing. On the other hand, there are various apertures of the reflecting mirror 11, and the larger the aperture of the reflecting mirror 11, the longer the focal length and the longer the stay 18. In such a case, when a crosswind A is received as shown in FIG. 4, a Karman vortex is generated by the round support arm 17 and the stay 18, and further
Since the reflector 11 side of the stay 18 is fixed, vibrations occur. The larger the diameter of the reflecting mirror 11, the sharper the directivity characteristics, and therefore the efficiency of the antenna will decrease even with minute vibrations. Furthermore, if vibration occurs repeatedly, it is easy to imagine that the screws will loosen and even breakage due to fatigue caused by the vibrations.

The present invention was developed in view of the above circumstances, and its purpose is to reduce the occurrence of Karman vortices caused by crosswinds, prevent the occurrence of vibration, prevent a decrease in antenna efficiency, and prevent accidents such as damage. An object of the present invention is to provide a parabolic antenna that can prevent such problems.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows a part of the parabolic antenna according to the present invention. In the same figure,
21 is a converter, and 22 is a radiator. These converter 21 and radiator 22 are integrated and fixed to one end of a support arm 23. The other end of this support arm 23 is fixed to the lower part of a parabolic reflector (not shown). Further, one end portion of this support arm 23 is supported by a stay 24. This stay 24 has a fourth
As shown exploded in the figure, it is fastened and fixed to the support arm 23 with a screw 26 with a fixed saddle 25 interposed therebetween. This stay 24 is bent into a substantially V-shape from its center, and threaded portions 27 are provided at both ends of the stay 24 as shown in FIG. It is fixed to the back rib 29.

The support arm 23 has a chevron portion 23 on its surface.
a is formed, and an opening is formed on the lower surface side, and the coaxial cable 30 is disposed inside the opening. Further, the stay 24 is formed of a hexagonal bar.

In the parabolic antenna having the above configuration, since both the support arm 23 and the stay 24 have a polyhedral shape rather than a pipe shape, the generation rate of Karman vortices is reduced compared to the conventional antenna when exposed to a cross wind. Therefore, the occurrence of vibrations in the converter 21 and the radiator 22 is reduced.

In the above embodiment, the outer shape of the stay 24 is a hexagonal bar, which is relatively easy to obtain, but it is not limited to this, and as shown in FIGS. It may have a streamlined shape, a lined shape, etc., and in short, any polyhedral shape other than a round shape may be used.

As described above, according to the present invention, it is possible to reduce the occurrence of Karman vortices caused by crosswinds, thereby preventing the occurrence of vibration, preventing a decrease in antenna efficiency, and preventing accidents such as damage. can.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of a conventional parabolic antenna, FIG. 2 is a front view, FIG. 3 is a perspective view showing the structure near the converter of a parabolic antenna according to an embodiment of the present invention, and FIG. 4 5 is an exploded perspective view showing the structure of the stay attachment part, and FIG. 5 is a side view showing another embodiment of the present invention. 21...Converter, 22...Radiator, 23...
...Support arm, 24...stay.

Claims (1)

[Scope of utility model registration request] a reflector; a converter and a radiator disposed at predetermined positions relative to the reflector; and a support arm fixed to the reflector at one end and supporting the radiator and converter at the other end. and a stay that is bent at a central portion, is screwed to the other end of the support arm at the central portion, and is attached to the reflecting mirror at both ends; A parabolic antenna characterized in that each of the arm and the stay has a polygonal outer peripheral shape.